mit-license/middleware/load-user.js

const { promisify } = require('util');
const readFile = promisify(require('fs').readFile);
const path = require('path');

module.exports = async (req, res, next) => {
  const id = req.hostname.split('.')[0];
  res.locals.id = id;

  if (req.method.toUpperCase() !== 'GET') {
    return next();
  }

  // Otherwise load up the user json file
  res.locals.user = {
    copyright: '<copyright holders>',
  };

  try {
    const data = await readFile(
      path.join(__dirname, '..', 'users', `${id}.json`),
      'utf8'
    );
    res.locals.user = JSON.parse(data);
  } catch ({code, message}) {
    res.code(500).send(`An internal error occurred - open an issue on https://github.com/remy/mit-license with the following information: ${message}`)
    return;
  }

  next();
};